See the differences between a release and the main branch #4329

The release page shows a changelog for every release but doesn't let us see the diff between the latest release and the main branch (i.e. the next release).

More precisely, I'd like to have new links on the release page:

• Unreleased commits (commits in main missing from latest release): https://github.com/$user/$repo/compare/$tag...master
• Hotfixed commits (released commits but not in main): https://github.com/$user/$repo/compare/master...$tag
• "Real" files changes between the latest release and main: https://github.com/$user/$repo/compare/$tag..master

As I'm writing this, I notice that this may not be relevant for all git flows (e.g. the ones where the main branch always match the latest release) but maybe there is a clever way to make this feature helpful to everyone?

Some examples of release pages:

• https://github.com/Mottie/GitHub-userscripts/releases (simple raw tags)
• https://github.com/sindresorhus/refined-github/releases (full featured releases with title and description)
• https://github.com/phoenixframework/phoenix/releases (collapsed releases)
• https://github.com/elixir-lang/elixir/releases (pre-releases)

Currently, I use a simple userscript to do that but it has some issues and I'd love to see this feature baked in Refined Github:

// ==UserScript==
// @name         Get next release changelog
// @match        https://github.com/*
// @grant        GM_registerMenuCommand
// ==/UserScript==

// Caveats:
// - only works for tags (not full featured releases).
// - doesn't work with "folded" releases (e.g. https://github.com/phoenixframework/phoenix/releases)
// - hardcoded "master" branch.

const goToCompareUrl = (getRange) => {
  const latestTag = document
    .querySelector(".release-entry .release-entry .commit-title a")
    .innerText.trim();
  window.location.href = window.location.href.replace(
    /\/releases/,
    `/compare/${getRange(latestTag)}`
  );
};

GM_registerMenuCommand("Files changes (..)", () => {
  goToCompareUrl((tag) => `${tag}..master`);
});
GM_registerMenuCommand("Unreleased commits (...)", () => {
  goToCompareUrl((tag) => `${tag}...master`);
});
GM_registerMenuCommand("Hotfixed commits", () => {
  goToCompareUrl((tag) => `master...${tag}`);
});